java.lang.ClassCastException：在自定義複合組件

我有一個活動，通過調用下面的xml來設置xml。這個xml佈局inturn調用一個自定義複合組件，它設置了兩個按鈕和一個edittext。然後，我的主要活動將從自定義複合組件定義的編輯文本中獲取值。我有下面的logcat報告，但看不到它是什麼，我不正確。java.lang.ClassCastException：在自定義複合組件

XML佈局文件

 <com.android.control.MinutePicker 
      android:id="@+id/MinPick" 
      android:orientation="vertical" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content"> 
     </com.android.control.MinutePicker>

com.android.control.MinutePicker

but1 = new Button(context); 
but1.setTextSize(TEXT_SIZE); 
but1.setText("-"); 
but2 = new Button(context); 
but2.setTextSize(TEXT_SIZE); 
but2.setText("-"); 
valueText = new EditText(context); 
valueText.setTextSize(TEXT_SIZE); 
valueText.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL); 
valueText.setText(0); 
this.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
LayoutParams elementParams = new LinearLayout.LayoutParams(ELEMENT_WIDTH, ELEMENT_HEIGHT); 

    addView(but1, elementParams); 
    addView(valueText, elementParams); 
    addView(but2, elementParams);

主要的活動，然後改掉得到編輯文本的價值。

   EditText Identifier = (EditText)findViewById(R.id.MinPick); 
      String value = Identifier.getText().toString(); 
      Toast toast = Toast.makeText(PerfectSleepActivity.this, value, Toast.LENGTH_SHORT); 
      toast.setGravity(Gravity.CENTER, 0, 0); 
      toast.show();

logcat的報告

05-08 19:03:56.141: E/AndroidRuntime(200): Uncaught handler: thread main exiting due to uncaught exception 
05-08 19:03:57.730: E/AndroidRuntime(200): java.lang.ClassCastException: com.android.control.MinutePicker 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.ap.df.DFActivity$2.onClick(PerfectSleepActivity.java:37) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.View.performClick(View.java:2344) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.View.onTouchEvent(View.java:4133) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.widget.TextView.onTouchEvent(TextView.java:6510) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.View.dispatchTouchEvent(View.java:3672) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712) 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.app.Activity.dispatchTouchEvent(Activity.java:1987) 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.view.ViewRoot.handleMessage(ViewRoot.java:1658) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.os.Looper.loop(Looper.java:123) 
05-08 19:03:57.730: E/AndroidRuntime(200): at android.app.ActivityThread.main(ActivityThread.java:4203) 
05-08 19:03:57.730: E/AndroidRuntime(200): at java.lang.reflect.Method.invokeNative(Native Method) 
05-08 19:03:57.730: E/AndroidRuntime(200): at java.lang.reflect.Method.invoke(Method.java:521) 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
05-08 19:03:57.730: E/AndroidRuntime(200): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 
05-08 19:03:57.730: E/AndroidRuntime(200): at dalvik.system.NativeStart.main(Native Method)

來源

2012-05-08 Somk

它看起來像你想投類類型MinutePicker（com.android.control.MinutePicker）來EditText上的這行代碼：

EditText Identifier = (EditText)findViewById(R.id.MinPick);

R.id.MinPick屬於MinutePicker類型，不是EditText。

這不起作用。 MinutePicker是否從EditText繼承？請發佈類標識符（不僅包含在其中的代碼）。

也許你的意思是做到以下幾點：

MinutePicker mp = (MinutePicker)findViewById(R.id.MinPick);

來源

2012-05-08 19:35:10 Jack

java.lang.ClassCastException：在自定義複合組件

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